Gas flow head on 325 e36 ?

[Trev24]

Howsit guys .

My 325 e36 is going to get its Valve seals replaced tomorrow and my mechanic suggested that he can gas flow my head at a rather reasonable price ..

The car is standard with just an exhaust , I'm keen to gas flow the head but is it worth it without a cam and stuff Or is it just gonna run my fuel consumption up and not justify the power ?

 

[ver328i]

Not sure hey. I recently did my valve stems as well and had intake and exhaust ports ground & polished or whaterver they call it...port matching...Cant say there's and improvement in the car or any change in consumption for that matter.

but I say that if you want to have it done, do it while the head is off. No sense in fitting it now and removing it 2 months down the line for gasflowing

 

[danieljames]

As far as my understanding...


Gas flowing/porting and polishing reduces the surface resistance on the airflow in your motor, so therefore your intake and exhaust velocities will "increase" and thus you have a gain in power....but don't quote me on this...that's just my understanding in of the science

 

[ballisticz466]

I would say that a increase in power is almost guaranteed, provided it's done properly. Not sure how much though and what effect it will have on the electronics. All the ports need to be done equally, and without testing how on earth are you gonna know if they are all equal. Hence you end up with one cylinder burning more the the next.

The thing is, to agitate the incoming air by having the intake ports very rough, and then to get the exhaust ports very smooth for a quicker exit. Correct me if I am wrong pls.

Could you include the price you are being charged for the gas flowing?

Maybe Gizmo or one of the more experienced guys could chip in here.

Good luck though.

 

[Teezy_F30]

smoothing out the rough castings definitely improves response in throttle as there is less resistance in the air flow .. but if im not mistaken, all the intake and exhaust inlets and exist need to have the same volume after flowed.

 

[Trev24]

I would say that a increase in power is almost guaranteed, provided it's done properly. Not sure how much though and what effect it will have on the electronics. All the ports need to be done equally, and without testing how on earth are you gonna know if they are all equal. Hence you end up with one cylinder burning more the the next.

The thing is, to agitate the incoming air by having the intake ports very rough, and then to get the exhaust ports very smooth for a quicker exit. Correct me if I am wrong pls.

Could you include the price you are being charged for the gas flowing?

Maybe Gizmo or one of the more experienced guys could chip in here.

Good luck though.

HI man . Believe it or not .. im getting it done for R300. my mechanic does it himself . He's a retired specialist . He's has flowed the head on two of his personal cars . He said tho an increase in fuel consumption can be expected. That's what I'm worried about because the car is gonna be a daily runner . I just want to know if the increase in power is worth the increase in consumption . Or should I rather wait until I put cams and stuff in and do the head job all At once ...

Your advice will really be appreciated bro

 

[moranor@axis]

BMW makes very good heads i would not do it unless the guy can prove gains... just polishing parts can have a negative effect on the boundary layer and decrease flow

I find it very questionable if the guy is willing to do it for R 300 and says it will increase fuel consumption this probably means you lose air flow making the engine work harder

flowing a head properly requires specialist equipment and even then some heads have nothing to gain

 

[Maljan]

Sounds like a good deal. But I would check on what the fuel injection computer make of it.

I did the cam thing on my first Golf GTi - twice. First mild then wild. The mild cam was a good compromise but of course it was not enough. On the Golf motor the head was different between the cams, So I had to start over again with another head. The wild cam was great on the track but a real hard work to drive on the street.

 

[cOlDFuSiOn]

If it ain't broke don't fix it .. Especially on a daily.. What's a new head going to cost should things not work out.. My 2c :=):

 

[danieljames]

If it ain't broke don't fix it .. Especially on a daily.. What's a new head going to cost should things not work out.. My 2c :=):

There's a good point right there

 

[Trev24]

Okay thanks a lot guys . I guess I'll just stick with the normal head :ty:

don't wanna take any chances and break anything .

 

[Redline]

R300???? That sounds to good to be true & we know how that normally works out.

I blew the head gasket on my daily & had the heads done by a stock racer, can't say I'm sorry but it cost me R1800.

Must also be said the mod is in conjunction with the branch, free flow, mild cam & chip so not in isolation.

Throttle response is improved as well as torgue spread, the car is very responsive from low revs & pulls hard till the red line, but as I say it was on top of existing mods.

 

[Inactive]

If someone quoted me R300 to gas flow any head never mind a e36 328 head I would run for the hills with my head under my arms and tail between my legs!

Dont do it.

 

[Abish]

My apologises for intruding this thread,

I'm a university student and and with bursary income i've got a good deal on an E36 325i coupe

Got it for a year now and unfortunately 2 days back Dad had used the car and its timing chain snapped...

my worries and concerns

- I planned on doing the engine end of next year as its '93 with 300k KM's and takes oil ,this came unexpected as in doing the timing chain alot of work might be required on the head so i might do the bottom end assembly aswell

- i've got a mechanic to do the entire job for R4000, but not sure what my parts will add up to

- I wanted power gains with minimal costings which is a bit of a stupid question but just want some advice

- I looked into stroker setup but afraid of compatibility with regards to the crank shaft and its sensor position and how will my BOSCH motronic work with this change, must i add new cam shafts ??

- if i am keep stock internals, maybe just add a 20 thou bored Piston..
what additions changes can be done the get significant power gains

Its a M50TUB25 engine

Please assist Guys
Kind Regards
Disheartened BMW OWNER

 

[wikked]

My advice : don't. Cut your losses now and get a sensible cheap and easy to maintain ride. Your student budget will thank you later.


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